The reason why Huawei has always used reverse charging for USB connection is to ensure that the mobile phone can provide power to the OTG device when connecting it, so as to ensure that the OTG device can work normally.This design is reasonable. If you don't need to use OTG devices, you just need to remove them.
Huawei Technologies Co., Ltd. is a private communication technology company focusing on the production and sales of communication equipment.The company was founded in 1987 by Ren Zhengfei, the main founder, and is headquartered in Shenzhen, China.Huawei has entered the CIS market since 1996, and expanded its business scope to major cities in China and Europe and the United States in 1998.In 2003, it established a joint venture with 3Com.In 2010, it was listed in the Fortune Global 500 for the first time, and in August 2016, it ranked first in the "2016 Top 500 Private Enterprises in China".
Huawei Technologies Co., Ltd., headquartered in Bantian Huawei Base, Longgang District, Shenzhen, Guangdong Province, China, was registered in 1987.As of 2007, the company's contract sales reached 16 billion US dollars, of which the overseas sales reached 11.5 billion US dollars. At that time, the company was the first in China's domestic electronics industry in terms of profits and taxes.By the end of 2008, Huawei's products and services had covered more than 100 countries and regions in the world.Among the top 50 telecom operators in the world, 45 have adopted Huawei's products and services.Huawei's products and solutions have been applied in more than 150 countries around the world, providing services to 45 of the world's top 50 operators and one third of the world's population.
After the phone is inserted into the USB stick (or OTG) and manually set to transmit data (or other options), related operations can be carried out normally. Because the phone needs to supply power to the USB stick (or OTG) in order for the USB stick to work properly, the system will automatically jump to the reverse charging option, which is normal and will not affect data transmission.
The software version has been upgraded to the latest.The OTG cable bought on the official website can read the USB flash drive after it is plugged in, but it has been charging the device in reverse all the time, and the phone soon runs out of power. Switching to "data connection only" or other items in the option will automatically jump back to "reverse charging". After the phone is inserted into the USB stick (or OTG) and manually set to transmit data (or other options), related operations can be carried out normally. Because the phone needs to supply power to the USB stick (or OTG) in order for the USB stick to work properly, the system will automatically jump to the reverse charging option, which is normal and will not affect data transmission. Generally speaking, MP3 is also a USB flash disk. Since it is a USB flash disk, it can be recognized by a manual Bai machine.First of all, you need an OTG adapter to connect the phone to the USB flash drive. At this time, the notification bar of the phone will automatically pop up a notice showing that the external memory has been connected. Click this notice, and the file management software will be automatically called to open it. At this time, you can transfer files to the USB flash drive.However, if your phone has multiple file management software, it is recommended that you use the system's own file manager. If you use a third-party file manager, you need to manually authorize read and write permissions.After entering, dao can copy and paste or cut and paste some documents into the USB stick.If it is not recognized, try restarting the phone, reinserting the USB flash drive, replacing the data cable, etc.If it still doesn't work, it can be basically determined that there is a problem with the file format of the USB flash disk. Go to the computer to format it.
I also encountered the same problem. After repeated troubleshooting, it is likely that the U disk is too large to be identified, which can only be 32G or less. If it is larger, it can not be identified, and only shows reverse charging.
